The Dreamwalker Duo 400 from Exped is essentially a backcountry comforter for two with a special bottom sheet to cover two sleeping mats. Couples can carry the weight and bulk of one sleeping bag and share heat to further increase sleeping warmth and comfort. 850-fill goose down is ultra-compressible and keeps you warmer than synthetic.
Lower Section: polyester sheet wraps around two mats
Upper Section: 850-fill goose down insulation snaps to lower sheet